Photo: Acroterion · CC BY-SA 4.0Living in Rosemont, MD: what to set up and who to call
Rosemont spans 2 ZIP codes; 21758 holds the most residents (95%). For emergencies, Rosemont is closest to Frederick Health Hospital, 12.8 miles away.
I’m new in town
What to set up in Rosemont, and who provides it. Tap an answer for the details and where they come from.
Power, water and internet
Who to call to start service at a new address in Rosemont.
Power comes from Potomac Edison
Potomac Edison (The Potomac Edison Co.), an investor-owned utility, serves all of Rosemont. Its homes paid an average of 15.4¢ per kWh in 2025, about $172 a month (its average across Maryland, for customers on its standard service). Maryland lets you buy power from another supplier; 2% of Potomac Edison’s home customers do, and Potomac Edison still delivers it.
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Rosemont Distribution System
Rosemont Distribution System supplies Rosemont: about 95% of residents live in its service area. About 4% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It buys treated surface water (EPA lists City of Brunswick as seller) and serves 237 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 77% of the 15,074 systems serving 101–500 people.
The system’s full record: EPA ECHO report
EPA SDWIS via Envirofacts (violations pulled Oct 9, 2026) and ECHO (lead samples, 2026Q3); service area: EPA Community Water System Service Area Boundaries v3.0. Violations are counted by the start of their compliance period. MD0100045.
5 home internet providers serve Rosemont
100% of 122 addresses can get 100/20 Mbps; 0% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Xfinity | Cable | 98% | 1,200/35 |
| Verizon | Fixed wireless | 93% | 300/20 |
| T-Mobile | Fixed wireless | 89% | 100/20 |
| AT&T | Fixed wireless | 87% | 100/20 |
| All Points Broadband | Fixed wireless | 69% | 10/1 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Rosemont’s trash rules yet
Pickup rules, the dump and recycling in Rosemont.
Where your child goes to school
Public school districts and the school path by grade.
Rosemont is in Frederick County Public Schools.
Test scores and every school: see Schools →U.S. Department of Education, NCES Common Core of Data, 2024–25. Enrollment rules and registration are the district’s.
Town hall and registering to vote
Who to call, and how to register.
Election office: FVAP local election office directory, updated Jul 2023; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Mar 11, 2026.
Rosemont spans 2 ZIP codes
ZIP codes where Rosemont residents live, with the share of the town in each.
| ZIP | Post office name | Share of Rosemont | ZIP’s residents in Rosemont |
|---|---|---|---|
| 21758 | Knoxville, MD | 95% | 5% |
| 21716 | Brunswick, MD | 5% | 0% |
Census 2020 ZIP Code Tabulation Areas, by census block; post office names: GeoNames (CC BY 4.0). ZIPs created since 2020 are missing.
Getting around, the ER and the library
One line each; the subject pages have the rest.
ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.
Questions about living in Rosemont
Who supplies Rosemont’s drinking water, and has it had violations?
Rosemont Distribution System (EPA ID MD0100045). It reported no health-based violations to EPA in the five years to October 2026; 77% of systems its size had none.
Who provides electricity in Rosemont?
Potomac Edison (The Potomac Edison Co.), an investor-owned utility. Its homes paid about 15.4¢ per kWh in 2025 (EIA).
What internet providers serve Rosemont?
Xfinity, Verizon, T-Mobile, AT&T, All Points Broadband (FCC, as of December 2025).
What ZIP codes are in Rosemont?
21758 (95%), 21716 (5%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Rosemont in?
Frederick County Public Schools.
How do I register to vote in Rosemont?
In Maryland you can register online until 21 days before Election Day, in person up to and including Election Day, or by mail (postmarked 21 days before). Elections here are run by the Frederick County Board of Elections. Check your registration at voterservices.elections.maryland.gov.
Sources & dates
Every answer above names its source. Here they are with their dates.
- Water: EPA SDWIS (Envirofacts, pulled Oct 9, 2026), ECHO SDWA 2026Q3, EPA CWS Service Area Boundaries v3.0.
- Power: HIFLD Electric Retail Service Territories (map Aug 2023); EIA-861 final 2025.
- Trash: OpenStreetMap, Geofabrik extract of Oct 9, 2026. © OpenStreetMap contributors (ODbL).
- ZIP codes: Census 2020 ZCTA relationship files; GeoNames postal codes (CC BY 4.0).
- Schools: NCES Common Core of Data, 2024–25.
- Registration: vote.gov, updated Mar 11, 2026 (read Oct 10, 2026). Official sites and area codes: Wikidata.
- Election office: FVAP local election office directory (fetched Oct 10, 2026; each record dated), EAC EAVS 2024 jurisdictions; registration and lookup links from vote.gov’s state data, checked Oct 10, 2026.
- Internet: FCC National Broadband Map, as of December 2025.